Kurzweil PC3A6 [219/423] Filters

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Effects and Effect Mode

Effects Overview

separation. The spacing between impulses is given in samples (20.8µs). At low values, the buzz

starts at high frequencies and drops slowly, while at high values the buzz starts at a lower pitch

and drops rapidly. Range is 0.0 to 40.0 samples, with a resolution of 0.2 sample.

Contour controls the overall shape of the reverb. When set to a high value, sounds passed

through the reverb start at a high level, and it slowly decays. As the control value is reduced, it

takes more time for the eect to build up before decaying. At a value of around 34%, the reverb

behaves like a reverse reverb, building up to a hit. When it is set to zero, the eect acts like a

simple delay. Range is 0 to 100%.

Filters

There are four types of Resonant Filter eects in the PC3A. All of them have these parameters in

common:

Filter Type (or FiltType) can be Lowpass, Highpass, Bandpass, or Notch (band-cut).

Resonance is the resonance of the lter, adjustable from 0 to 50 dB.

Resonant Filter

Frequency (or Freq) is the xed resonant frequency of the lter. Its range is 16 to 8372 Hz.

Envelope Filter

Envelope Filter is a resonant lter whose center frequency can be made to vary according to the

level of the incoming signal.

Filter Type can be Lowpass, Highpass, Bandpass, or Notch (band-cut).

Min Freq is the minimum resonant frequency of the lter, that is, the lter frequency when the

input gain is below the triggering threshold. Its range is 16 to 8372 Hz.

Sweep determines how far the resonant frequency moves when the input level increases. At

positive levels it moves up in pitch, and at negative levels it moves down. The highest possible

resonant frequency is 8372 Hz, the lowest is 0 Hz. This parameter’s range is -100% to +100%.

Resonance is the resonance of the lter, adjustable from 0 to 50 dB.

Atk Rate adjusts the upward slew of the attack portion of the envelope detector. Range is 0 to

300.0 dB/sec.

Rel Rate adjusts the downward slew of the release portion. Range is 0 to 300.0 dB/sec.

Smooth Rate slows down the envelope follower. If it is set to a lower rate than Atk Rate or Rel

Rate, it can dominate those parameters. Range is 0 to 300.0 dB/sec.

Triggered Filter

The Triggered Filter is a sweeping resonant lter that triggers when a certain input threshold is

reached, and then follows its own envelope, consisting of an instantaneous attack and an

exponential release, rather than the envelope of the input signal.

Max Freq is the resonant frequency of the lter at the peak of the internal envelope. It can be set

lower than Min Freq (above), in which case the lter will sweep downwards, then back up.

Range is 16 to 8372 Hz.

Trigger is the input-signal threshold at which the envelope detector triggers. Range is -79 to

0 dB.